BufferMap映射复制文件，出异常，内存溢出！！！

[kyousuke]

下面的程序是使用映射文件ByteBufferMap来复制一个文件，每次复制到大概7,8百M的时候就出内存溢出异常
大家看看是什么原因啊？我的电脑内存是2G，每次映射文件的大小是128M
复制的文件大小是1.3G

java.io.IOException: Map failed
	at sun.nio.ch.FileChannelImpl.map(Unknown Source)
	at iotest.ByteBufferMap.main(ByteBufferMap.java:38)
Caused by: java.lang.OutOfMemoryError: Map failed
	at sun.nio.ch.FileChannelImpl.map0(Native Method)
	... 2 more

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.IntBuffer;
import java.nio.channels.FileChannel;

public class ByteBufferMap {

    public static void main(String[] args) {
	FileChannel fcIn = null;
	FileChannel fcOut = null;
	try {
	    String filePath = "F:\\Anime\\Gundam00\\S2\\25.mkv";//1.3G
	    fcIn = new FileInputStream(new File(filePath)).getChannel();
	    fcOut = new RandomAccessFile(new File("G:\\1.mkv"), "rw").getChannel();
	    IntBuffer bufOut;
	    IntBuffer bufIn;
	    
	    long readSize = 128 * 1024 * 1024;//每次映射的大小
	    long s;//映射开始处
	    long e;//映射结束处
	    int i = 0;
	    long allSize = fcIn.size();//文件的大小
	    
	    long start = System.currentTimeMillis();
	    
	    do {
		s = i++ * readSize;
		e = s + readSize > allSize ? s + allSize % readSize : s + readSize;
		bufIn = fcIn.map(FileChannel.MapMode.READ_ONLY, s, e).asIntBuffer();
		bufOut = fcOut.map(FileChannel.MapMode.READ_WRITE, s, e).asIntBuffer();
		
		while(bufIn.hasRemaining()) {
		    bufOut.put(bufIn.get());
		}
		
	    } while(e < allSize);
	    
	    long end = System.currentTimeMillis();
	    System.out.println("Time:" + ((double) ((end - start) / 1000)) + "s");
	    
	} catch(IOException e) {
	    e.printStackTrace();
	} finally {
	    try {
		fcIn.close();
		fcOut.close();
	    } catch (IOException e) {
		e.printStackTrace();
	    }
	    
	}
    }
}

[kyousuke]

找到原因了，我把map的第三个参数理解错了
现在可以复制完了，最后出了这个异常，不知道怎么回事

java.io.IOException: 拒绝访问。
	at sun.nio.ch.FileChannelImpl.truncate0(Native Method)
	at sun.nio.ch.FileChannelImpl.map(Unknown Source)
	at iotest.ByteBufferMap.main(ByteBufferMap.java:34)

[kyousuke]

[Quote=引用 1 楼 jxsfreedom 的回复:]
找到原因了，我把map的第三个参数理解错了
现在可以复制完了，最后出了这个异常，不知道怎么回事

Java code

java.io.IOException: 拒绝访问。
at sun.nio.ch.FileChannelImpl.truncate0(Native Method)
at sun.nio.ch.FileChannelImpl.map(Unknown S……
[/Quote]

又找到原因 了，- -！自言自语了，大家无视我好了

[soli11722984]

LZ把正确答案的代码都发上来

[kyousuke]

package iotest;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.IntBuffer;
import java.nio.channels.FileChannel;

public class ByteBufferMap {

    public static void main(String[] args) {
	FileChannel fcIn = null;
	FileChannel fcOut = null;
	try {
	    String filePath = "F:\\Anime\\Gundam00\\S2\\25.mkv";
	    fcIn = new FileInputStream(new File(filePath)).getChannel();
	    fcOut = new RandomAccessFile(new File("G:\\1.mkv"), "rw").getChannel();
	    IntBuffer bufOut;
	    IntBuffer bufIn;
	    
	    int readSize = 256 * 1024 * 1024;//每次映射的大小
	    long s;//映射开始处
	    long e;//映射结束处
	    int i = 0;
	    long allSize = fcIn.size();
	    System.out.println(Integer.MAX_VALUE + " " + readSize);
	    
	    long start = System.currentTimeMillis();
	    
	    do {
		s = i++ * readSize;
		e = s + readSize > allSize ? allSize % readSize : readSize;
		/*System.out.println(s);
		System.out.println(e);
		System.out.println(allSize + "\n");*/
		bufIn = fcIn.map(FileChannel.MapMode.READ_ONLY, s, e).asIntBuffer();
		bufOut = fcOut.map(FileChannel.MapMode.READ_WRITE, s, e).asIntBuffer();
		
		while(bufIn.hasRemaining()) {
		    
		    bufOut.put(bufIn.get());
		}
		
	    } while(s + e < allSize);
	    
	    long end = System.currentTimeMillis();
	    System.out.println("Time:" + ((double) ((end - start) / 1000)) + "s");
	    
	} catch(IOException e) {
	    e.printStackTrace();
	} finally {
	    try {
		fcIn.close();
		fcOut.close();
	    } catch (IOException e) {
		e.printStackTrace();
	    }
	    
	}
    }
}

[mediagao]

这段代码还是会出现：java.io.IOException: Map failed。

[A_S478]

java.io.IOException: 拒绝访问。 at sun.nio.ch.FileChannelImpl.truncate0(Native Method) at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:731) at com.gdcn.download.http.DownFileHelper.downFile(DownFileHelper.java:132) 代码： bytes= new byte[(int)(outSize-startsSize)]; 错误行： MappedByteBuffer out =channel.map(MapMode.READ_ONLY,startsSize,outSize); out.get(bytes); //获取bytes大小的字符流加载到bytes数组中 if(bytes != null) cleanMappedByteBuffer.clean(out); 如今我也出现这问题了